1984 3.2 ICV stays running even with ignition off

[198491132]

Good Day, My idle control valve stays vibrating even with ignition off.

I just got back from a two day 500 mile run. Car runs great, no issues when running. I did have a warm start problem after 200 miles, stopped the car for 20 minutes, then no start. Tested and found no spark from coil. Changed out the DME relay, swapped with different coil. Still no start. Put back original DME and coil, after another ten minutes, and double checking DME, car started. No further problems from the trip except maybe a drop of rpms very low between shifts.

Tonight, walked out to the garage and heard the ICV running. Bentley manual seems to reference a no run condition, mine will not shut off.

Any thoughts?

Thanks, Dave

[ischmitz]

If the ICV keeps running the DME is powered. Either your ignition switch (no likely as it would prevent you from shutting the engine down) or the DME relay is bad. My guess is a fused-shut 1st stage of the DME relay.

With the ICV running pull the DME relay and listen/feel carefully if you feel it click. It probably won't. If that stops the ICV get a replacement DME relay.

Ingo

[198491132]

Good Day Sir,

After sitting overnight, replaced wiring harness to ICV, vibration had stopped. Turned on ignition, ICV started. Turned off ignition, ICV kept running. Replaced DME relay, as suggested, and all now functioning correctly.

Questions: Would a series of harsh road and bumps cause the DME relay to go bad? I had several rough road events on the trip a few days ago.

Could this be related to the warm no spark issue? At the time of failure, I did swap out the DME relay with the current one in the car now, which is functioning correctly.

FYI on the warm no spark, CHT replaced 2500 miles ago.

Thanks! AS USUAL - you where correct with your diagnostics.

Dave

[DRACO A5OG]

The solder joint may have cracks and could be shorting after harsh road conditions.

You should always carry a spare DME relay on our 3.2s